Actually configure test for tonce... :-\

So I mentioned this test wasn't an appropriate test yet because of a bug
I found in webmock - in testing that bug, I had failed to fix the test
appropriately to actually configure for tonces.  When the webmock bug is
fixed, this would start failing without this commit.  Sorry.
Merge pull request #49 from knewter/feature/allow_tonce

Actually configure test for tonce... :-\